20T202DA5JB Pacer Components, 20T202DA5JB Datasheet - Page 14

• Manufacturer Part Number: 20T202DA5JB
• Description: Vfd,vacuum Fluorescent Display
• Manufacturer: Pacer Components

2X20 VFD Module with 2-Wired Interface
6.2.9 Write Data to CG or DD-RAM
6.2.7 Set CG-RAM Address
6.2.8 Set DD-RAM Address
This instruction:
(1) Load a new 6-bit address into the address counter (ACC).
(2) Sets the address counter (ACC) to address CG-RAM.
Once "Set CG-RAM Address" has been executed, the contents of the address counter (ACC) will be automatically
modified after every access of CG-RAM, as determined by the "Entry Mode Set" instruction".
The active width of the address counter (ACC), when it is addressing CG-RAM, is 6 bits, so the counter will wrap
around to 3FH from 00H if more than 64 bytes of data are written into CG-RAM.
This instruction:
(1) Loads a new 7-bit address into the address counter (ACC).
(2) Sets the address counter (ACC) to point to the DD-RAM.
Once the "Set DD-RAM Address" instruction has been executed, the contents of the address counter (ACC) will be
automatically modified after each access of DD-RAM, as selected by the "Entry Mode Set" instruction
This instruction writes 8-bit binary data (D7 to D0) into CG-RAM or DD-RAM. To write into CG-RAM or DD-RAM
is determined by the previous specification of the CG-RAM or DD-RAM address setting. After a write, the address is
automatically increased or decreased by 1 according to the entry mode. The entry mode also determines the display
shift. When data is written to the CG-RAM (UDF character data), the D7, D6 and D5 bits are not displayed as
characters.
*Valid DD-RAM Address Ranges
RS = 0
RS = 0
RS = 1
D7
D7
D7
0
1
2nd line
1st line
D6
D6
D6
1
Number of Character
D5
D5
D5
Character Code (Write-in)
40
40
D4
D4
D4
ADD
D3
D3
D3
ACG
D2
D2
D2
20T202DA5JB (Rev. 2.0)
Address Range
Page - 14 of 16
00H to 27H
40H to 67H
D1
D1
D1
D0
D0
D0
C0H ~ E7H for 2nd Line
80H ~ A7H for 1st Line
00H ~ 0FH for CG-RAM Code
10H ~ FFH for CG-ROM Code
Hex. Range
40H ~ 7FH
Hex. Range
Hex. Range
.